• dmp's avatar
    Add autoconf support to detect an LLVM-based C compiler · 6247b59e
    dmp authored
    This patch adds support to the autoconf scripts to detect
    when we are using a C compiler that uses an LLVM back end.
    An LLVM back end does not support all of the extensions use
    by GCC, so we need to perform some conditional compilation
    in the runtime, particularly for handling thread local
    storage and global register variables.
    The changes here will set the CC_LLVM_BACKEND in the
    autoconf scripts if we detect an llvm-based compiler. We use
    this variable to define the llvm_CC_FLAVOR variable that we
    can use in the runtime code to conditionally compile for
ghc.mk 6.64 KB